In this paper

one specially reusable and easy-operated graphical user program for plotting copolymer composition curve is developped with Matlab GUI tools. Its development process includes conceiving graphical user interface

the drawing and adjustment of control

setting the graphic object properties

the compilation and debugging of M-file.The graphical user program can achieve functions of plotting

parameter display

snapping coordinates and setting curve style ect. .Good results has been received in the teaching of polymer chemistry by using it

the internal relations between the trend of composition curve and the value range of reactivity ratio

and the fundamental reasons of this relation can be obtained through randomly inputting values of reactivity ratio;The method of control copolymer composition also can be found by monomer feed ratio which was confirmed according to using the graphical user program.